Issue #3029697 by catch, alexpott: [Symfony 4] Exception: Notice: A non well...

Issue #3029697 by catch, alexpott: [Symfony 4] Exception: Notice: A non well formed numeric value encountered

core/modules/system/tests/modules/render_attached_test/src/Controller/RenderAttachedTestController.php

@@ -15,7 +15,7 @@ class RenderAttachedTestController {
    */
   public function teapotHeaderStatus() {
     $render = [];
-    $render['#attached']['http_header'][] = ['Status', "418 I'm a teapot."];
+    $render['#attached']['http_header'][] = ['Status', 418];
     return $render;
   }